Testo 420 Flow Hood Kit and Meter

Overview

The Testo 420 is a lightweight, accurate airflow capture hood system designed for balancing volume flow at HVAC registers and returns. Weighing less than 6.4 lbs (2.9 kg), it provides NIST-traceable calibration and features patented flow straighteners that significantly improve measurement accuracy at turbulent outlets. The detachable 420 multi-function control unit can also be used independently with optional pitot tubes and flow matrix for duct measurements, making it a versatile solution for HVAC professionals.

Key Features

• Lightweight design under 6.4 lbs (2.9 kg) with ergonomic handles for comfortable use at height
• Patented flow straighteners improve accuracy and stability at turbulent outlets
• NIST traceable calibration certificate included
• Detachable multi-function meter measures flow velocity, volume flow, absolute pressure, temperature, and relative humidity
• Bluetooth connectivity and free mobile app for remote monitoring and real-time measurement streaming
• 2 GB onboard data logging with USB transfer capability
• Optional interchangeable flow skirts in multiple sizes and configurations
• Convenient rolling carrying case

Applications

• HVAC system balancing and commissioning at supply and return registers
• Airflow measurement in ducts with optional pitot tubes
• Testing at elevated locations and above head height
• On-site field measurement protocols and reporting

Included Accessories

• NIST traceable calibration certificate
• Rolling carrying case
• Mini-USB cable for data transfer